Cloudburst

An intense storm forms overhead in a 1/2 mile radius circle centred on the caster. Lightning arcs to the ground at four different points you can see within range. Each creature in a 40-foot-radius sphere centred on each point you choose must make a Dexterity saving throw. The sphere spreads around corners. A creature takes 20d6 lightning damage and 20d6 thunder damage on a failed save, or half as much damage on a successful one.  A creature in the area of more than one lightning strike is affected only once. The storm dissipates at the beginning of your next turn.

The spell damages objects in the area and ignites flammable objects that aren't being worn or carried.